Google: sys-kernel/csql-kernel-6_1, sys-kernel/csql-kernel-6_6, sys-kernel/lakitu-kernel-6_1, sys-kernel/lakitu-kernel-6_6, sys-kernel/lakitu-nc-kernel-6_6, sys-kernel/lakitu-vgpu-kernel-6_6, sys-kernel/tpusev-kernel-6_6: security update to 18613.675.7

high Tenable Self-Hosted Container Security Plugin ID 466277

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

- In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Fix shadow paging use-after-
free due to unexpected role Commit 0cb2af2ea66ad ("KVM: x86: Fix shadow paging use-after-free due to
unexpected GFN") fixed a shadow paging mismatch between stored and computed GFNs; the bug could be
triggered by changing a PDE mapping from outside the guest, and then deleting a memslot. The rmap_remove()
call would miss entries created after the PDE change because the GFN of the leaf SPTE does not match the
GFN of the struct kvm_mmu_page. A similar hole however remains if the modified PDE points to a non-leaf
page. In this case the gfn can be made to match, but the role does not match: the original large 2MB page
creates a kvm_mmu_page with direct=1, while the new 4KB needs a kvm_mmu_page with direct=0. However,
kvm_mmu_get_child_sp() does not compare the role, and therefore reuses the page. The next step is
installing a leaf (4KB) SPTE on the new path which records an rmap entry under the gfn resolved by the
walk. But when that child is zapped its parent kvm_mmu_page has direct=1 and kvm_mmu_page_get_gfn()
computes the gfn for the 4KB page as sp->gfn + index instead of using sp->shadowed_translation[] (or
sp->gfns[] in older kernels). It therefore fails to remove the recorded entry. When the memslot is dropped
the shadow page is freed but the rmap entry survives, as in the scenario that was already fixed. Code that
later walks that gfn (dirty logging, MMU notifier invalidation, and so on) dereferences an sptep that lies
in the freed page, causing the use-after-free. (CVE-2026-53359)

Solution

Update the sys-kernel/csql-kernel-6_1 library and its related packages to version 18613.675.7 or later.

Plugin Details

Severity: High

ID: 466277

Version: Revision 1.1

Type: Local

Family: Google COS Security Checks

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Critical

Score: 9

Percentile: 99.76

Vendor

Vendor Severity: HIGH

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.3

Vector: CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C

CVSS Score Source: CVE-2026-53359

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.9

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Vulnerability Publication Date: 7/4/2026

Reference Information

CVE: CVE-2026-53359

Detections

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